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A source said: "Kris Marshall has already joined the cast and will regenerate at the end of this series, not in the Christmas special.

"They won't risk a woman Doctor. They want a David Tennant type."

Bookies have stopped taking bets on the identity of the new Doctor.

Typically the Doctor regenerates into his new form during the Christmas special. In 2009's The End of Time, fans saw David Tennant's 10th Doctor transform into Matt Smith's 11th Doctor, and in 2012's The Time of the Doctor, Matt regenerated into Peter's 12th Doctor.

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The Tardis was fitted into the narrow tunnels of the cave, while Redcliffe Wharf was used as a unit base.

Natalie Moore of Bristol Film Office said: "Doctor Who is an iconic example of the best in British TV with a large and loyal audience, so it's fantastic to have supported the latest series with our city's locations.

"This isn't the first encounter we've had with the Doctor and his Tardis - Peter Capaldi filmed series nine at Leigh Court in 2015 and Matt Smith filmed series seven at Tyntesfield House in 2012, as well as Tyndall Avenue and Royal Fort House in central Bristol.

"Most recently of course we facilitated filming at Redcliffe Caves for last year's spin-off series Class, starring Capaldi alongside a cast of new talent."